 The 1994 national census reported a total population for this woreda of 80,358, of whom 40,007 were men and 40,351 women; 4,334 or 5.39% of its population were urban dwellers at the time.The two largest ethnic groups reported in Seru were the Oromo (93.64%), and the Amhara (6.08%); all other ethnic groups made up 0.28% of the population.Oromiffa was spoken as a first language by 90.62%, and 5.86% spoke Amharic; the remaining 3.52% spoke all other primary languages reported.